You seem to have an upgrade failure because the configuration files from the base-files package have been locally modified on your system, and a new version of the configuration files is available in the updated package, and this requires guidance from the end user to know which version of the config files you want. Are these updates being applied noninteractively through unattended-upgrades? While the specific error message is unhelpful, I don't know that we would fix the root of this issue in unattended-upgrades; instead, you probably want to run 'update- manager' on your desktop to upgrade the package interactively and decide what to do with these config files using the prompt.
It is also strange that apport reports all of these conffiles as modified on your system. The ones attached to your bug report appear to be identical to the ones shipped in the base-files package. ** Changed in: base-files (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to base-files in Ubuntu. https://bugs.launchpad.net/bugs/1788192 Title: package base-files 10.1ubuntu2.2 failed to install/upgrade: end of file on stdin at conffile prompt Status in base-files package in Ubuntu: Incomplete Bug description: I have been facing update problems every month. ProblemType: Package DistroRelease: Ubuntu 18.04 Package: base-files 10.1ubuntu2.2 ProcVersionSignature: Ubuntu 4.15.0-32.35-generic 4.15.18 Uname: Linux 4.15.0-32-generic x86_64 ApportVersion: 2.20.9-0ubuntu7.2 AptOrdering: base-files:amd64: Install base-files:amd64: Configure NULL: ConfigurePending Architecture: amd64 Date: Tue Aug 21 10:15:39 2018 Dependencies: ErrorMessage: end of file on stdin at conffile prompt InstallationDate: Installed on 2018-03-14 (159 days ago) InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.1) Python3Details: /usr/bin/python3.6, Python 3.6.5, unpackaged PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, unpackaged RelatedPackageVersions: dpkg 1.19.0.5ubuntu2 apt 1.6.3 SourcePackage: base-files Title: package base-files 10.1ubuntu2.2 failed to install/upgrade: end of file on stdin at conffile prompt UpgradeStatus: No upgrade log present (probably fresh install) modified.conffile..etc.issue: Ubuntu 18.04 LTS \n \l modified.conffile..etc.issue.net: Ubuntu 18.04 LTS modified.conffile..etc.lsb-release: DISTRIB_ID=Ubuntu DISTRIB_RELEASE=18.04 DISTRIB_CODENAME=bionic DISTRIB_DESCRIPTION="Ubuntu 18.04 LTS" mtime.conffile..etc.issue: 2018-04-24T05:34:22 mtime.conffile..etc.issue.net: 2018-04-24T05:34:22 mtime.conffile..etc.legal: 2015-10-22T15:15:21 mtime.conffile..etc.lsb-release: 2018-04-24T05:33:11 mtime.conffile..etc.update-motd.d.00-header: 2015-10-22T15:15:21 mtime.conffile..etc.update-motd.d.10-help-text: 2016-06-14T09:23:23 mtime.conffile..etc.update-motd.d.50-motd-news: 2017-06-29T12:35:01 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/base-files/+bug/1788192/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp